All good, however, a warning sound and light is going off for a reason, they need to find the reason and solve. Until then it is IMHO a safety issue as the owner does not know why the alarm has been triggered. From what has been stated they do not appear too bothered that the alarm has been triggered and their solution is to switch off the alarm rather than solve the problem. I feel that is a safety issue.
Not a good approach from Lexus I feel.